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The spectral properties of a large sample of low surface brightness disk galaxies

Published online by Cambridge University Press:  01 April 2008

Y. C. Liang ,
G. H. Zhong ,
L. C. Deng  and
B. Zhang
Y. C. Liang*
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
G. H. Zhong
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China Department of Physics, Hebei Normal University, Shijiazhuang 050016, China
L. C. Deng
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China
B. Zhang
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China Department of Physics, Hebei Normal University, Shijiazhuang 050016, China
*
†email: ycliang@bao.ac.cn
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Abstract

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We present the spectral properties of a large sample of nearly face-on low surface brightness (LSB) disk galaxies selected from the SDSS-DR4 main galaxy sample. About 12,282 LSB galaxies have been selected from the photometry database with their B-band central surface brightness μ0(B) ranging from 22 to 24.5 mag arcsec−2. About 7000 of such LSBGs have measured emission lines ([OII]3727, [OIII]5007, Hβ, Hα, [NII]6583) with the S/N ratio greater than 5σ. Their spectral diagnostic diagram of [NII]/Hα vs. [OIII]/Hβ shows that ~89% of them are star-forming galaxies, and ~11% could be classified as AGNs. The relations of μ0(B) vs. 12+log(O/H) and μ0(B) vs. stellar masses M* of these star-forming LSB galaxies show that their O/H and M* increase following the increasing μ0(B). The majority of these LSBGs are on the higher branch of metallicity.

Keywords

Galaxies: abundancesgalaxies: evolutiongalaxies: fundamental parametersgalaxies: spiralgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 119 - 120
Copyright
Copyright © International Astronomical Union 2008

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